>Former U.S. officials said the internet-based platform, which was first used in war zones in the Middle East, was not built to withstand the sophisticated counterintelligence efforts of a state actor like China or Iran. “It was never meant to be used long term for people to talk to sources,” said one former official. “The issue was that it was working well for too long, with too many people. But it was an elementary system.”

>“Everyone was using it far beyond its intention,” said another former official.